Alloy C276 Round Rod ASTM EN GB Standard

1. Chemical Composition (Key Parameters)

2. Mechanical & Physical Properties

2.1 Mechanical Properties (Hot-Rolled Condition, per ASTM B574)

2.2 Physical Properties

3. Production Process of Hot-Rolled Alloy C276 Round Bars

1. Raw Material Melting & Casting
   • High-purity nickel, molybdenum, chromium, and tungsten are melted in an electric arc furnace (EAF) or vacuum induction melting (VIM) furnace to avoid contamination.
   • The molten alloy is cast into cylindrical ingots (billets) via continuous casting or static casting, with diameters ranging from 150 mm to 500 mm.
2. Homogenization Annealing
   • Billets are heated to 1050–1100°C and held for 8–12 hours to eliminate chemical segregation and improve workability.
3. Hot Rolling
   • Annealed billets are heated to 1000–1100°C (the alloy’s optimal hot-working temperature range) and passed through a series of rolling mills.
   • The billets are gradually reduced in diameter to form round bars of the desired size (common diameters: 10 mm–300 mm). Hot rolling enhances grain structure and mechanical strength.
4. Solution Annealing & Quenching
   • After rolling, bars undergo solution annealing at 1120–1150°C for 30–60 minutes, then rapidly quenched in water or air. This step dissolves carbides and precipitates, restoring maximum corrosion resistance.
5. Surface Treatment
   • Bars are descaled (via pickling with nitric-hydrofluoric acid) to remove oxide layers formed during rolling.
   • Optional finishing processes: grinding, polishing, or turning to achieve precise dimensional tolerance (e.g., h9/h10) and surface roughness (Ra ≤ 6.3 μm).
6. Quality Inspection
   • Non-destructive testing (NDT): Ultrasonic testing (UT) for internal defects, magnetic particle testing (MT) for surface cracks.
   • Chemical composition analysis (via 光谱 analysis, OES), mechanical property testing (tensile, hardness), and dimensional verification.

4. International Standards

5. Equivalent Grades

6. Applications

• Chemical Processing Industry
  • Components for sulfuric acid production (reactors, heat exchangers), hydrochloric acid handling (pumps, valves), and pharmaceutical synthesis (reaction vessels).
• Oil & Gas Industry
  • Downhole tools, wellhead components, and pipeline parts for offshore and sour gas environments (resists H₂S and chloride-induced SCC).
• Environmental Engineering
  • Flue gas desulfurization (FGD) systems, wastewater treatment equipment, and incinerator parts (withstands acidic fumes and high temperatures).
• Aerospace & Defense
  • Engine components, rocket nozzles, and military hardware (tolerates high-temperature oxidation and chemical exposure).
• Other High-Performance Sectors
  • Nuclear power plant components (resists radiation-induced degradation), marine engineering (seawater-resistant fasteners), and semiconductor manufacturing equipment (high-purity requirements).